Typescript 2.8: Remove properties in one type from another

Question

In the changelog of 2.8, they have this example for conditional types:

type Diff = T extends U ? never : T;  // Remove types from T that are assi         


        

Answer 1

Well, leveraging your Diff type from earlier (which by the way is the same as the Exclude type which is now part of the standard library), you can write:

type ObjectDiff<T, U> = Pick<T, Diff<keyof T, keyof U>>;
type AWithoutStuff = ObjectDiff<A, Stuff>; // inferred as { one: string; two: number; }